2656000003421 has 2 divisors, whose sum is σ = 2656000003422. Its totient is φ = 2656000003420.

The previous prime is 2656000003409. The next prime is 2656000003513. The reversal of 2656000003421 is 1243000006562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447242684196 + 1208757319225 = 1203014^2 + 1099435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656000003421 - 2¹⁸ = 2655999741277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656000003021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328000001710 + 1328000001711.

It is an arithmetic number, because the mean of its divisors is an integer number (1328000001711).

Almost surely, 2^{2656000003421} is an apocalyptic number.

It is an amenable number.

2656000003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656000003421 is an equidigital number, since it uses as much as digits as its factorization.

2656000003421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 2656000003421 its reverse (1243000006562), we get a palindrome (3899000009983).

The spelling of 2656000003421 in words is "two trillion, six hundred fifty-six billion, three thousand, four hundred twenty-one".